The first two wave types, P and S, are called body waves because they travel or propagate through the body of Earth. The latter two are called surface waves they the travel along Earth's surface and their amplitude decreases with depth into Earth.
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The team bought ruby rings at Lord & Taylor, Macy's and Littman Jewelers, and a ruby pendant at JCPenney, paying thousands of dollars. The ring from Macy's, for example, had a $1,200 price tag. Asked if the ruby was natural, the Macy's saleswoman said: It is real. It is natural. Want an issue or rip-off investigated? Email Rossen Reports